Basically what I meant was:
As of now there weren't many "full on" sex scenes with penetrations and even less with the main LIs, since the game is slowly building up for it. The first scenes we got were with side characters that more felt like reminders that Eternum is indeed a porn VN.
This is about to change, since we had two "full sex scenes" with the actual LIs already and at least two more are likely "immanent" with Nova potentially happening in 0.7 and Annie already teasing that she "will be ready", likely for 0.8.
Also Dalia got pretty close in 0.7 as well and she soon as her birthday in story...so...
So in that sense the game will be back-loaded going from no sex scenes with the LIs to teasing, hand- and blowjobs to "full sex scenes" and apparently a number of threesomes as well towards the end.
And even if Cari keeps it to three per update, I would still expect that in future upgrades (maybe starting with 0.8 or 0.9) 2 or even all 3 of them to be full penetration scenes with the LIs instead of maybe only one of them.